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  1. Replies
    8$$
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    242

    Not submerged in Hydrogen Peroxide, just a higher...

    Not submerged in Hydrogen Peroxide, just a higher than normal mixture in the atmosphere. I will try to find some MI with the 316SS.
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    6$$
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    278

    Resistance Calculation 3Phase Delta Load

    I have a 20,000W 460V 3Phase Delta heater load. I am trying to calculate the resistance.

    I-Line = 20000W/460V/Sqrt3 = 25.1A
    I-Phase = 25.1/Sqrt3 = 14.5A

    R-Phase = 460/14.5 = 31.7 Ohms
    ...
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    8$$
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    242

    Mineral insulated jacket is likely what I will...

    Mineral insulated jacket is likely what I will need....
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    8$$
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    242

    I do not think the sheath and the jacket are...

    I do not think the sheath and the jacket are vapor proof. I would still be concerned with the wires corroding inside the sheath and jacket.
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    8$$
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    242

    Thermocouples to use with Hydrogen Peroxide

    I would like to install a thermocouple in an environment that may contain higher than normal concentrations of hydrogen peroxide. I would think that Type “T” would definitely not be ideal for this...
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    11$$
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    448

    Very helpful, thanks everyone.

    Very helpful, thanks everyone.
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    11$$
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    448

    The input of the SSR going to be a base of a...

    The input of the SSR going to be a base of a transistor right? Is the input impedance of a transistor base typically high?
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    7$$
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    311

    Yes, the end goal here would be to minimize any...

    Yes, the end goal here would be to minimize any noise getting out through the equipment power lines. The SSR controls a heater load, that is time proportioned over a 2 second period. The most it...
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    11$$
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    448

    My controller has 9VDC output voltage. The mini...

    My controller has 9VDC output voltage. The mini input module accepts the 9VDC signal as an input, but the output of this mini input module is only able to handle 3A. My heater load is 20A. So I am...
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    11$$
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    448

    Leakage Current Activating SSR

    I have a controller that provides a 9V DC output that is connected to an SSR module which is in turn activating an SSR that is controlling a heater. The when my controller is not calling for output,...
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    7$$
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    311

    Zero Crossing SSR's

    Are zero crossing SSR's devoid of electrical noise? Also, can someone please recommend a cable shield to place between two bundles of power wires (one bundle is 460V and the other is 115V) they have...
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    10$$
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    321

    Looks like their MJN line will work...

    Looks like their MJN line will work...
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    10$$
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    321

    Thanks for the information everyone, as always...

    Thanks for the information everyone, as always extremely helpful. If anyone can recommend a 230V single pole ice cube relay that has a HP rating o 1/3HP, I would greatly appreciate it. My usual...
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    10$$
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    321

    The relays are definitely rated to make and break...

    The relays are definitely rated to make and break the load, yet they are still turning black after less than a year of use. Is it normal for the relays to turn black after only a years use?

    I...
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    10$$
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    321

    The relays actually have a 2500VA interrupt...

    The relays actually have a 2500VA interrupt rating. For an inductive load this would still be the measured current multiplied by the voltage. My load is 2.9A at 230V gives me 667VA...
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    10$$
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    321

    HP Rated Relays

    What is the difference between inrush ratings of a relay and HP rating. Would the HP rating have to be used to confirm that you can break the inductive load, while the in rush is just to cover the...
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    14$$
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    520

    Thanks for reminding me of that. For a typical...

    Thanks for reminding me of that. For a typical wall outlet, that has 1 line at approximately 110V to a ground reference, and the other line at approximately 0V to ground reference, is it technically...
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    14$$
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    520

    So can a true technical Neutral only exist in a 3...

    So can a true technical Neutral only exist in a 3 wire system, as the 4th grounded conductor?
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    14$$
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    520

    Phase to Neutral 110V

    I understand that the 110V that enters an American household is actually half of a single 220V phase. The 110V is derived from the grounded center tap of a transformer before it enters the home. Is...
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    14$$
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    395

    I believe it reads or as well. The motor does...

    I believe it reads or as well. The motor does not have an internal overload, I am not sure why.
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    14$$
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    395

    I have it mostly figured out except for the fact...

    I have it mostly figured out except for the fact that it is a 1.25 service factor motor, which allows 125% rounded down, but its temperature rise is above 40 C, so I would have to go to 1.15%. Is...
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    14$$
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    395

    It is an automatic start motor. It will be an...

    It is an automatic start motor. It will be an air circulator motor inside of a refrigeration/oven chamber. Refrigeration equipment itself is not a general purpose equipement. Would the motor...
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    14$$
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    395

    430.32(1) says "Motors with a marked temperature...

    430.32(1) says "Motors with a marked temperature rise 40 C or less 125%". I would get this information from the insulation rating right? In this case it is Class F insulation. The temperature...
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    14$$
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    395

    So a dual element fuse or a thermal magnetic...

    So a dual element fuse or a thermal magnetic breaker would qualify, even though it would be serving the dual purpose of short circuit protection and overload protection?
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    14$$
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    395

    I've read through section III of article 430 (NEC...

    I've read through section III of article 430 (NEC 2011) and do not see the exception that allows you to use a single thermal-magnetic breaker or dual element fuse as short circuit AND overload...
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